An ion exchange resin is used to soften water. The ion exchange resin has a volume of 0.15 m3and a resin capacity of 63 kg CaCO3/m3. The flow of water is measured as 2500 L/day, the influent hardness is 340 mg/L as CaCO3 and the desired hardness is 70 mg/L as Ca CO3. If 25% of the water is bypassed, how long can the resin operate before all sites are saturated and regeneration required?

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

With increases in magnification, which of the following occur? a. the field of view decreases. b. the ambient illumination decreases. c. the larger parts can be measured. d. the eyepiece must be raised.

Plan an experiment to measure the surface tension of a liquid similar to water. if necessary, review the ncfmf video surface tension for ideas. which method would be most suitable for use in an undergraduate laboratory? what experimental precision could be expected?